/*********************************************************************************
 * The contents of this file are subject to the Common Public Attribution
 * License Version 1.0 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.openemm.org/cpal1.html. The License is based on the Mozilla
 * Public License Version 1.1 but Sections 14 and 15 have been added to cover
 * use of software over a computer network and provide for limited attribution
 * for the Original Developer. In addition, Exhibit A has been modified to be
 * consistent with Exhibit B.
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for
 * the specific language governing rights and limitations under the License.
 * 
 * The Original Code is OpenEMM.
 * The Original Developer is the Initial Developer.
 * The Initial Developer of the Original Code is AGNITAS AG. All portions of
 * the code written by AGNITAS AG are Copyright (c) 2007 AGNITAS AG. All Rights
 * Reserved.
 * 
 * Contributor(s): AGNITAS AG. 
 ********************************************************************************/

package org.agnitas.web.filter;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

import org.apache.commons.lang.StringUtils;

public class CharacterEncodingFilter implements Filter {

	private String encoding = "UTF-8";
	/**
	 * destroys this filter
	 */
	public void destroy() {
		
	}

	/**
	 * executes this filter
	 */
	public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws ServletException, IOException {
		request.setCharacterEncoding( encoding );
		response.setCharacterEncoding( encoding );
		chain.doFilter(request, response );
		response.setCharacterEncoding( encoding );
	}

	/**
	 * initializes this filter
	 */
	public void init(FilterConfig config) throws ServletException {
		String encodingParam = config.getInitParameter( "encoding" );
		if ( StringUtils.isNotEmpty( encodingParam ) ) {
			this.encoding = encodingParam;
		}
	}

}
